Hi Jorge,The clave metronome apps are meant to be run from a smartphone or any tablet computer/mobile device. I'm not sure if they would run on a desktop/laptop computer.

ITunes is not required to run either the Android or iPhone/iPad app, but apparently for iPhone/iPad you must go to iTunes app store to get the program. If you have an iPhone/iPad I think iTunes is pre-installed and the ability to access iTunes store to download apps should be very easy.

I'm an Android user, so not all that familiar with iPhones.Android users download directly from Google apps.

The programs (apps) are very small, directly downloaded to/from your mobile device, and easy to un-install if not to your liking.

I find this metronome app really good. However it seems only to be available for I phone. What I find particularly good about this app is you can program the beats so I've been able to practice to all the claves, bell patterns etc.